Got it ! Weird I couldn’t find any hit on tsukundere on a websearch ^^’
There it is for the others debian (and derivate) fellow users :
sudo apt install libsdl2-dev guile-3.0-dev
cd /tmp
wget https://files.dthompson.us/guile-sdl2/guile-sdl2-0.5.0.tar.gz
tar xvf guile-sdl2-0.5.0.tar.gz
cd guile-sdl2-0.5.0
./configure
make
sudo make install
cd /tmp
wget https://gitlab.com/lilyp/tsukundere/-/archive/0.4.x/tsukundere-0.4.x.tar.gz
tar xvf tsukundere-0.4.x.tar.gz
cd tsukundere-0.4.x
autoreconf -vif
./configure
… Oh noooooooooes ! T_T
configure: error: required guile module not found: (sdl2)
I felt like the “make install” for sdl2 worked though, no error was triggered °0°